Process for the dyeing of cellulose esters and ethers



Patented Nov. 13, 1928.

UNITED STATES PATENT orrics.

ARMIN GOESCHKE, OF BASEL, SWITZERLAND, ASSIGNOR TO SOCIETY OF CHEMICAL INDUSTRY IN BASLE, OF BASEL, SVTITZERLANI).

PROCESS FOR THE DYEING 0F CELLULOSE ESTER S AND ETHERS.

No Drawing. Application filed November 4, 1926, Serial No 146,283, and in Switzerland. November 14, 1925.

The present invention relates to the dye- 7 ing of cellulose esters and others, such as acetyl cellulose and acetate silk. It comprises the new dyeing process and the mate rial dyed with the new dyestuffs.

It has been found that the indophenols corresponding with the general formula:

I I 1] l R1\N R wherein at least one of the ys stands for a halogen atom, and wherein the other ys mean halogen atoms or hydrogen atoms, the 01s representing hydrogen atoms or substituents which contain at the most two carbon atoms, and R and R, a hydrogen atom, alkyl, aryl and aralkyl residues, are very suitable for the production of fast tints on cellulose esters and ethers, as for instance acetate silk. On that material the above named indophenols yield, preferably in presence 01' a dispersing agent, such as s'uljtite waste liquor, condensation products from naphthalene sultonic acids with formaldehyde, salts of lignin sultonic acids, Turkey red oil etc., blue to green shades which are distinguished from those obtained with the indophenols, which have been hitherto recommended for the dyeing of cellulose esters, not only by their shade and their purity, but also by their fastness to light and storing. Theseresults, which could not be torsecn, constitute a considerable technical progress.

The indophenols coming into consideration in the invention may be obtained by several methods, for instance by simultaneous oxidation of a halogenized p-aininoplienol and an aromaticamine having a free paraposltion, or by condensation of a halogenized p-nitrosophenol with an aromatic amine with free para-position, or by simultaneous oxidation oi a suitable p-diamine with a halogenized phenol with free para-position.,.

As halogenized p-amidophenols there'have to be considered especially the Q-chloro-h amino-l-phenol, the 2.6-dichloro-4-amino-1- phenol, the 2.3.6-trichloro-l-amino-l-phenol, as aromatic amines with free para-position, aniline or o-toluidine, their N-alkyl derivatives, such asd'iethyland dimethylaniline, ethylbenzylaniline, N-ethylphenyl-glycine,

vN-methyldiphenylamine, meta-diamines and Example.

1 part of the indophenol from 2.6-dichlorol-aminophenol and dimethylaniline corresponding probably with the formula:

N- N: =0 CH3 O O a I a is made into a paste by trituration with 1 to 1% parts of, sulfite waste liquor 0t 30 to 50% strength. To this paste 2 parts oi a hot soap solution of (3% strength are added and the whole is stirred and diluted with lukewarm water to 2000 parts.

In the dyebath thus prepared 100 parts of acetate silk are introduced and worked for A of an hour while raising the temperature slowing to 70 C. The material is thenrinsed and dried. There is obtained a turquoise blue having excellent properties of tastness.

p In an analogous manner the other indoph enols coming here into consideration may be employed.

Bluer shades are obtained generally with indophenols carrying in the phenolic nucleus only one chlorine atom, such as the indophehole from 2-chloro-et-amino-l-phenol and dimethylaniline or o-toluidine, etc, greener shades are also in general obtained'with the indophenols from 2.6-dihalogenet-amino-1- phenols, such as the indophenols from 2.6-- dichloro-d-amino-l-phcnol or Qfi-dibromolamino-l-phenol and dimethylaniline or diethylaniline corresponding probably with the formula: i

mula R meaning CH 0" C H (seelirst para, of the example), still greener shades are produced with the indonhenols from further halogeni'ced aminophenols, such the products made from 25.6%trichloro--aminoel-' phenol and diethylaniline corresponding;

probably with the formula:

(/BH5\L ON= C2H5/ The nature and the position otthe substitu- 'ent-sinthe diaminonucleus ot the indophenol may furthern'iore have influence with the shade of theclyestu'tl A pronouncedvgreen shadeis obtained, torinstance, with the indophenol made "from 2.6-dichlorol-aminodphenol and ,acotyl-metaetoluylene-diamine and corresponding probably with the tor- Nn o o-om o1 HgN- ---N:

I I CH3 What I claim is p 1. A process for the dyeing: o1 agronp of cellulose derivatives comprising cellulose esters and others which consists in dyeing this material with ndopheuols which may be representedhy the general'formnla:

wherein at ,least one of lZllQfjS-StlIlClS for a halogen; atom and wherein the other y s mean halogen atoms or hydrogen atoms, the ws representing hydrogen atomsv or, suhstituents which contain at themost two and R and R a hydrogen atom, allzyl, aryl or ,aralkylzresidnes.

.2; A process for thondyeing oi cellulose esters which consists in dyeing this material i t representing hydrogen atoms or which contain at the two ca" and R, and R a hydrogen atom,

with indophenols which may he represented by the general :tormula: i

ll R1 N =o iRz n Y whereinat least enact the g s, stands fora halogenatom and wherem the other ys mean halogen atoms or hydrogen or arallzyl residues.

3. A process for'the dy lulose wlnch consists in dry carbon atoms with indo phenols which may he represented by the general formula:

l l y l I -O- R/ l l l w x y 1/ wherein at leastone oft e y/s' stands tora the other y s mean en atoms, the ws repnesentin Hydrogen atoms or suhstituents which 001 in at the most two carhon atoms s a hydrogen atom, alkyl, aryl r i 'esidnes.

l. A processi or the dyeingof a group of cellulose derivatives comprising cellulose esters and others which consists in dyeing this material will ,indophenols which may he representedhy the general formula:

wherein at the most 3 of the ysstand fora halogen atom and the,remainingys "for hydrogen atoms, the :vsrepresonting lrvdrogen atoms or suhstituents which contain at the most two carbon atoms andR andjll; a hydrogen atom, allcyl, aryl or aralkyl residues.

5. A process torthe dyeing); Qfacotyl cellulose which consistsiin (ilyeinp; thismaterial with indophenols which may be represented by the general formula:

wherein at the most 3 of the y s stand for a halogen atom and'theremaining y/s tor hydrogen atoms, the We representing hydrogen atoms or snhstituents which contain the most two carbon atoms and R and R a hydrogen atom, alkyl, aryl or aralkyl residues.

7. A process foritlie dyeing of a group of cellulose derivatives comprising cellulose esters and others which consists in dyeing this material with the indophenols which may be represented by the general formula:

wherein at the most 3 of the ys stand for a halogenatom and the remaining ys for hydrogen atoms, R and meaning a hydrogen atom, alkyl, aryl or aralkyl residues.

8. A process for the dyeing of acetyl cellulose which consists in dyeing this material with the indophenols which may be repre sented by the generalformula:

i i R1 \N N= =0 R/ O I: v 11 wherein at the most 3 of the ys stand for a halogen atom and the remaining ys for hy drogen atoms, R and R meaning a hydrogen atom, alkyl, aryl or aralkyl residues.

9. A process for the dyeing of acetate silk which consists in dyeing this material with indophenols which may be represented by the general formula:

Halogen Halogen wherein R and R stand for a hydrogen atom, alkyl or aralkyl residues.

11. A process for the dyeing of acetyl cellulose which consists in dyeing this material with the indophenols which may be represented by the general formula N- N V R wherein R and R stand for a hydrogen atom, alkyl and aralkyl residues.

12. A process for the dyeing of acetate silk which consists in dyeing this material with Halogen Halogen the indophenols which may be represented by the general formula:

. llialogen R1 R Halogen wherein R, and R stand for a hydrogen atom, alkyl or aralkyl residues.

13. A process for the dyeing of a group of cellulose derivatives comprising cellulose esters and ethers which consists in dyeing this material with the indophenols which may be representd by the general formula:

wherein R and R stand for a hydrogen atom, alkyl or aralkyl residues.

14. A process for the dyeing of acetyl cellulose Which consists in dyeing this material with the indophenols which may be represented by the general formula:

wherein R and R stand for a hydrogen atom, alkyl or aralkyl residues.

15. A process for the dyeing of acetate silk which consists in dyeing this material with the indophenols which may be represented by the general formula:

wherein R and R stand for a hydrogen atom, alkyl or aralkyl residues.

16. A process for the dyeing of a' group of cellulose derivatives comprising cellulose esters and ethers which consists in dyeing this material with the indophenols which may be represented by the general formula:

17. A process for the dyeing of acetyl cellulose which consists in dyeing this material with the indophenols which may be represented by the general formula:

Alkyl Alkyl 18. A process for the dyeing of acetate silk which consists in dyeing-this mate" a} .xvith -i the indophenols which maybe i'epi'esentedby the general formula:

21.- ()rga iic substitution derivatives of ce1- lulose dyed with the dyestuffs of claim 7.

22. Organic substitution derivatives of co]- lulose dyed With the dyestuffs of claim 10.

'23. Organie substitution derivatives of ceiiulose dyed with the d tuiis ot shim 13.

24. Organic substitution derivatives 0t ceiluiose dyed with the dyestuffs of claim 16.

In Witness whereof I have hereunto signed 111. name this 22d day of Oetohei 1928.

ARE IN GQESCHKE. 

